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Simplifying -3(1 + -7r) = 186 (1 * -3 + -7r * -3) = 186 (-3 + 21r) = 186 Solving -3 + 21r = 186 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 21r = 186 + 3 Combine like terms: -3 + 3 = 0 0 + 21r = 186 + 3 21r = 186 + 3 Combine like terms: 186 + 3 = 189 21r = 189 Divide each side by '21'. r = 9 Simplifying r = 9
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